Malicious PDF — malware analysis report

Static analysis result for SHA-256 890cff4c095e0feb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd9217fc0de32c7ea969898194c7cc77 SHA-1: 1bfa13401ae4bfc7cbefb90aaf7d742c0b38cddf SHA-256: 890cff4c095e0febf06ce75c4db6da560f142fc70d7d7e2c88c76fd5c4c5a5c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs and the document structure suggest an attempt to disguise malicious content as legitimate links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5935

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n3nllemqu4qseh4g9dord9ro7/83543316941.pdf In PDF document text
    • https://ww150005.linebot.net/upfile/files/20210915235636.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3dc48eb2---boxajikuxelage.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/tebufikolofukixosev.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/34196829513.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/xironazerime.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/wogix.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16315479962017.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/01e0812c176c7803a0e5507ea81e2aeb/19728595580.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/45282506274.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/24751247909.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbf467fec---89360394152.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/gevuzujufigevobofigi.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/zalisuk.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135bda7087f1---sizonenad.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/gekekeniwanetibixanad.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/wozivewaseguz.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/panerukizikewig.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/27921149995.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/96742991016.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/puxivenogadejelutivus.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/385532581.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3abed09564680c3276a91bf7f68ac4d9/69067884978.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/33832262955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nfs+mw+apk+modPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 10244 bytes
SHA-256: 2e13828e89d8d59091f96a21342a9c00ab196edfb2f3bff9f0f8241400bc2c76
font_02_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 19980 bytes
SHA-256: eb39a0a6b069d4c5ee778d27f9a741b2e902f90298b6bf39469c7ff2269b003b